Test: are there three sides of a triangle ?

Sunday, July 4, 2010

 // C08_Ex 9: Input 3 whole number.
// 3 This is an integer form three sides of a triangle or not ?
// If so, what is the triangle?

#include <stdio.h>

void main()
{
    int a, b, c;
    printf("Input 3 whole number: ");
    scanf("%d%d%d", &a, &b, &c);

    if (a + b > c && a + c > b && b + c > a)
    {
        // This is the 3 sides of a triangle
        if (a == b && b == c)
            printf("=> This is an equilateral triangle\n");
        else
        {
            if (a == b || b == c || c == a)
                printf("=> This is an isosceles triangle\n");
            else
            {
                if (a*a + b*b == c*c || b*b + c*c == a*a || c*c + a*a == b*b)
                    printf("=> This is a right triangle\n");
                else
                    printf("=> This is a regular triangle\n");
            }
        }
    }
    else
        printf("=> This is not the three sides of a triangle\n");
}